Priming device for internal-combustion engines.



F. D. MALTBY.

PHIMING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION man DEC.30.I916.

hmntd May 7,1918.

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application filed December vice for internal combustion engines whichtill may be quickly and easily operated,

Second, to provide an improved priming device for internal \combustionengines which may be applied to be operated from the dash or from thefront of a motor vehicle.

Third, to provide an improved priming device for internal combustionengines which does not interfere with the normal operation of thecarbureter.

Fourth, to provide an improved priming device for internal combustionengines which may be adjusted for the constant running of the engine inthe event of the carbureter becoming inoperative or to supplement thecarbureter as occasion may requlre.

Fifth, to provide an'improved priming device whichis comparativelysimple in its parts and not likely to get out of repair or becomeinoperative.

Further objects, and objects relating to structural details, willdefinitely appear from the detailed description to follow.

l[ accomplish the objects of my invention by the devices and meansdescribed in the following specification. The invention is clearlydefined and pointed out in the claims. A structure which is a preferredembodiment of my invention is clearly illustrated in the accompanyingdrawing, forming a part of this specification, in which:

Figure l is a detail side elevation of a structure embodying thefeatures of my invention, a carbureter and manifold being shown in theiroperative relation therewith but on a greatly reduced scale as comparedwith the scale of the priming pump.

Fig. H is an enlarged .detail partially in longitudinal section on linecorresponding to line 2-2 of Fig. l[.

Fig. HT is an enlarged detail section showing structural features of theinlet valve.

Specification of Letters JPatent.

Patented May *3, ram. 30,1916. Seriallto.139,887. 7

In the drawing, similar reference char acters refer to similar partsthroughout the .several views,

and the sectional views are taken looking in the direction of the littlearrows at the ends of the section lines.

Referring to the drawing, 1 designates the manifold of an internalcombustion engine and 2 the carbureter,-3 designates the fuel connectionto a carbureter and 4 the dash orfront of a motor vehicle. These partsare shown largely in conventional form, the manifold being that of aFord motor car.

I provide a priming pump cylinder 5 and a coacting plunger 6 providedwith a suitable packing 7 and a rod 8 which is slidably mounted in thecap 9 which is threaded upon the barrel 10 of the pump. The cap 9 isprovided with a longitudinal recess 11 for receiving a compressionspring 12 surrounding the rod 8, one end of the spring bearing againstthe plunger 6 and the other against the end of the cap 9. The rod 8 isprovided with a suitable head or finger piece 13 by means of which itmay be reciprocated. In the adaptation shown in Fig. l, the rod 8 isarranged to project through a plate 14' mounted on the dash 4 and havinga slot 15 therein forthe rod 8. The cylinder is pro vided with adischarge port 17 in its side and a laterally projecting passage'arm 18threaded into the manifold 1 at the branching point thereof, as shown inFig. H. The delivery nozzle 19 is threaded into the end of the arm toproject into the manifold at a central point and is provided withdischarge and atomizing perforations 20 and 20. The discharge port 17 isprovided with a return check valve 21 held to its seat by the coiledspring 22 which is supported by the nozzle 19. a

A tube-like inlet valve seat member 23 is arranged in the end of thecylinder 10 and provided with a flange 24 engaging the end of cylinder.This valve seat member is secured in place by means of athheadedcoupling 25 threaded upon the cylinder to clamp the valve seat member inplace. The valve seat member 23 is provided with a central conical seat26 for the conical valve 27 which is provided with a stem 28. The valve.27 is provided with a facing 27 of leather or other suitable fibrousmaterial so that in event of any sediment lodging on the valve seat. itwill be embedded in the facing and not prevent the closing of the valve.A compression spring 28 is arranged on the stem with one end seatedagainst a shoulder 29 in the member 24 and the other end bearing againsta; pin 30 through the end of the stem. This spring acts to maintain thevalve 27 seated. The end of the stem 28 of the inlet valve projects intothe coupling 25 which constitutes a housing for the spring 28.

The fuel supply pipe 32 is connected to the supply pipe 3by the union33. The fuel pipe 32 is connected to the externally threaded end of thecoupling 25 by means of a threaded union 34, a suitable gasket 35 beinginterposed between the flanged end of the fuel pipe 32 and the end ofthe coupling member 25 to insure a liquid tight connection.

! As the plunger 6 on its return stroke passes the discharge port 17 ittemporarily traps a quantity of the liquid fuel above the valve 27forcing the valve to its seat and cushioning the stroke of the plunger.The packing-7 of the plunger is disposed in a spaced relation to itsinner end so that when the plunger is in its inner position the packingis at the rear of the discharge port 17 The inner end of the plunger isa, sliding fit in the cylinder, but this does not prevent the trappedliquid fuel from escaping through the port 18 quite rapidly buttemporarily traps it as stated. When in its inner'position, the plungerengages the valve 27, holding it firmly to its seat and preventing anyfuel being drawn through the primer to the engine, which would be highlyobjectionable and interfere with the normal operation of the carbureterwith which the engine is equipped. The spring 12 acts to urge theplunger in its normal or inner position.

It is found under certain conditions to be desirable in starting theengine to furnish a supply of fuel in addition to that supplied by thecarbureter, which can be done by retracting the plunger to permitfeeding of the fuel through the priming device. To assist in locatingthe plunger at the desired point for this purpose, I provide aretracting lever 36 which is forked at 37 to receive the plunger rod 8,the plunger rod being provided with a cOllar 38 with which the leverengages. The lever is pivoted on ears 39 on the plate 14 and is providedwith an adjustable stop 40 adapted to engage the dash, thereby stoppingthe plunger when the lever is actuated in the desired position.

In the operation of the device in starting the engine the plunger isretracted which draws a charge into the cylinder and the charge isforced out when the plunger is actuated and the fuel is forced throughthe atomizing nozzle in a fine spray or atomized condition so that whenthe engine is cranked a good explosive mixture is pro vided. As thenozzle is disposed centrally in the manifold, the charge is delivered sothe cylinders may draw uniformly therefrom.

The plunger, when in its inner position, closes the port 17, as stated,and also when in its inner position holds the inlet valve to its seat,thereby preventing the suction of the engine from drawing fuel into themanifold through the priming device unless the piston is adjusted topermit this.

In the adaptation illustrated in Fig. I, I show the plunger rod arrangedto be operated from the drivers seat which is the desired arrangementwhen the vehicle is equipped with a self-starter. In the modificationshown in Fig. VI, the plunger rod 8 projects through vehicle so that itmay be adjacent the starting crank of a vehicle which is not providedwith a self starter. This is of very great advantage as it enables thecranking of the car before the atomized fuel condenses.

It should be noted that the screw threaded connection of the passage arm18 provides a pivot means about which the priming pump may be rotated sothat it may be operated either from the dash or from the front of thevehicle as may be desired.

My improved priming device is simple in structure and easily installedor applied to engines as commonly constructed and it may be readilyadapted to meet the conditions of the particular engine to which it isapplied.

I have illustrated and described my improvements in the form in which Ihave embodied and adapted the same in use. I have not attempted toillustrate or describe various modifications which might be desirablefor adapting my improvements to meet different conditions as I believethe disclosure made will enable those skilled in the art to which myinvention relates to embody or adapt the same as conditions may require.I desire, however, to be understood as claiming my inventionspecifically in the form illustrated as well as broadly within the scopeof the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is: a

1. In a ,pl'iming device, the combination opening the inlet valve or theradiator 41 of the 9 naeaata of a cylinder having a delivery port in itsside, a tubular inlet valve seat member having a conical valve seat inits inner end disposed in the inner end of said cylinder and shoulderedto engage the end thereof, a coupling member threaded'upon said cylinderto embrace said valve seat member and clamp the same in position, aconical inlet valve provided with a fibrous facing seating in said.valve seat member and having a stem disposed longitudinallytherethrough, a coiled spring arranged on said stem to urge said valveto its seat, a plunger reciprocating past said delivery port and in itsinner position constituting a valve therefor so that on the in-stroke ofthe plunger a quantity of liquid is temporarily trapped above the inletvalve forcibly seating it, said plunger being adapted when in its innerposition to engage the inlet valve and being provided with a packingdisposed in a spaced relation to its inner end so that the packing is atthe rear of the cylinder discharge when the plunger is in its initialposition, and a spring urging said plunger to its inner position.

2. In a priming device, the combination of a cylinder having a deliveryport in its side, a tubular inlet valve seat member hav; ing a conicalvalve seat in its inner end disposed in the inner end of said cylinder,a coupling member threaded upon said cylinder to embrace said valve seatmember and clamp the same in position, a conical inlet valve providedwith a fibrous facing seating in said valve seat member, a plungerreciprocating past said delivery port and in its inner positionconstituting a valve therefor so that on the in-stroke of the plunger auantity of liquid'is temporarily trapped a ove the inlet valve forciblyseating it, said plunger being adapted when in its inner position toengage the inlet valve and being provided with a packing disposed in aspaced relation to its inner end so that the packing is at the rear ofthe cylinder dis; charge when the plunger is in its initial po-'-sition, and a spring urging said plunger to its inner position.

3. lin a priming device, the combination of a cylinder having a deliveryport in its side, a tubular inlet valve seat member havi g a conicalvalve seat in its inner end disposed in the inner end of said cylinder,a coupling member threaded upon said cylinder to embrace said valve seatmember and clamp the same in position, a conical inlet valve providedwith a fibrous facing seating in said valve seat member, a plungerreciprocating past said delivery port and in its inner positionconstituting a valve therefor so that on the in-stroke of the plunger aquantity of liquid is temporarily trapped above the inlet valve forciblyseating it, said plunger being adapted when in its inner po sition toengage the inlet valve and being provided. with a packing disposed in aspaced relation to its inner end so that the packing is at the rear ofthe cylinder discharge when the plunger is in its initial position.

4. In a priming device, the combination of a cylinder having a deliveryport in its side, a tubular inlet valve seat member having a valve seatin its inner end disposed in the inner end of said cylinder andshouldered to engage the end thereof, a coupling member threaded uponsaid cylinder to embrace said valve seat member and clamp the same inposition, an inlet valve seating in said valve seat member and having astem disposed longitudinally therethrough, a coiled spring arranged onsaid stem to urge said valve to its seat, a plunger reciprocating pastsaid delivery port and in its inner position constituting avalv-etherefor so that on the in-strokeof the plunger a quantity of liquid istemporarily trapped above the inlet valve forcibly seating it, saidplunger being adapted when in its inner position to engage the inletvalve, and a spring urging said plunger to its inner position.

' .5. In a priming device, the combination of a cylinder havmg adelivery port in its side, a tubular inlet valve seat member having avalve seat in its inner end disposed in the inner end of said cylinder,a coupling member threaded upon said cylinder to 'embrace said valveseat member and clamp the same in position, an inlet valve seating insaid valve seat member, a plunger reciproeating past said delivery portand in its inner position constituting a valve therefor so that on thein-stroke of the plunger a quantity of liquid is temporarily trappedabove the inlet valve forcibly seating it, said plunger being adaptedwhen in its inner position to engage the inlet valve, and a springurging said plunger to its inner osition.

6. In a primin device, t e combination of a cylinder havmg a deliveryport in its side and provided with a conical valve seat vat its mnerend, a conical inlet valve provided with a fibrous facing seating insaid valve, a spring urging said' inlet valve to its seat, a plungerreciprocating past said delivery port and in its inner positionconstituting a valve therefor so that on the instroke of the plunger aquantity of liquid is temporarily trapped above the inlet valve, saidplunger being adapted when in its inner position to engage the inletvalve and being provided with a packing disposed in a spaced relation toits inner end so that the, packing is at the rear of the cylinderdischarge when the plunger is in its initial position.

7. In a primmg device, the combination of a cylinder having a deliveryport in its side and provided with an inwardly opening inlet valve atits inner end, a plunger reciprocating past said delivery port and inits inner position constitutin a valve therefor so that on the in-stro eof the plunger a quantity of liquid is temporarily trapped abovethe'inlet valve, said plunger being adapted when in its inner positionto engage the inlet valve and being provided with a acking disposed in aspaced relation to its inner end so that the packin is at the rear ofthe cylinder discharge W en the plunger is in its initial position.

8. In a priming device, the combination of a cylinder having a deliveryport in its side and provided with an inwardly opening inlet valve atits inner end, a plunger reciprocating past said delivery port and inits inner position constituting a valve therefor so that on thein-stroke of the plunger a quantity of liquid is temporarily trappedabove the inlet valve, said plunger being adapted when in its innerposition to engage the inlet valve and being provided with a packingdisposed in a spaced relation to its inner end so that the packing is atthe rear of the cylinder discharge when the plunger is in its initialposltion, and a spring urging said plunger to its inner po- 9. In apriming device, the combination of a cylinder having a delivery port inits side and provided with an inwardly open- 7 packing is at the'rear ofthe cylinder displunger is in its initial charge when the positionpermitting the trapped liquid to gradually escape.

of a cylinder having a delivery port in its s1de and provided with aninwardly openng inlet valve, and a plunger reclprocat- 1ng p ast saiddelivery port and in its inner position constituting a valve therefor sothat on the in-stroke of the plunger a quantlty of liquid is temporarilytrapped above the inlet valve seating it.

11. In a priming device, the combination of a cylinder having a deliveryport in its s1de and provided with an inwardly opening inlet valve atits inner end, a plunger rec procating past said delivery port and inits mner position constituting a valve therefor so that on the in-strokeof the plunger a quantity of liquid is temporarily trapped above theinlet valve seating it, said plunger being adapted when in its innerposition to engage the inlet valve.

In witness whereof, I have hereunto set my hand and seal in the presenceof two witnesses.

FRANK D. MALTBY.

Witnesses:

MERTON W. WENTwonTH, L. C. PARSHALL.

10. In a priming device, the combination

